there is 10% profit by selling a book. If the selling price would have been Rs 7 less ,then there would have been 4% loss. what is the cost price of the book
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SP=CP+10CP/100
SP=110CP/100
if selling price is 7 less,
SP-7=CP+4CP/100
SP=104CP/100+7
equating both equations,
SP=110CP/100=104CP/100+7
(110CP/100)-(104CP/100)=7
6CP/100=7
6CP=700
CP=700/6=116.66
therefore the cost price is 116.66 rupees.
SP=110CP/100
if selling price is 7 less,
SP-7=CP+4CP/100
SP=104CP/100+7
equating both equations,
SP=110CP/100=104CP/100+7
(110CP/100)-(104CP/100)=7
6CP/100=7
6CP=700
CP=700/6=116.66
therefore the cost price is 116.66 rupees.
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